Calling Code Lookup Skill

Overview

Pass any two-letter ISO country code to retrieve its international phone dialing codes, common name, and official name. Because some jurisdictions share or use multiple prefixes, calling codes arrive as an array. Paid plans add geographic region and subregion details.

Live Test Calling Code Lookup Skill Skill →

The tool

Once your client is connected to the VerveKit server, this appears in its tool list as CallingCodeLookupSkill. It is read-only and open-world — it fetches and never mutates anything on your side — so most clients call it without asking you to confirm.

Tool call

{
  "name": "CallingCodeLookupSkill",
  "arguments": {
    "country": "FR"
  }
}

You do not name the tool yourself; the model picks it. Asking about FR in the terms this skill covers is enough for it to reach for CallingCodeLookupSkill on its own — naming it explicitly also works, and is the way to force the call.

Connecting

One server URL covers every skill in the catalog, including this one. Authorization is OAuth: the client opens a browser once, and there is no key to paste into a config file.

{
  "mcpServers": {
    "vervekit": {
      "url": "https://api.vervekit.com/v1/mcp"
    }
  }
}

Per-client setup — Claude, Cursor, VS Code, ChatGPT — is on the MCP setup page.

Arguments

These are the properties on the tool's inputSchema, so a well-behaved client validates them before the call is made. Premium arguments are accepted on every plan but only take effect on plans that include them.

Argument	Type	Description
`country`Required	string	The 2 letter ISO code for the country (e.g. FR) length 2–2

What the model gets back

The result carries a structuredContent object matching the tool's declared outputSchema, so a client reads fields without parsing prose. status is "ok" and error is null on success; a null field means the value was not available for that input, not that the call failed.

Result

{
  "status": "ok",
  "error": null,
  "data": {
    "country": "France",
    "officialName": "French Republic",
    "countryCode": "FR",
    "callingcodes": [
      "+33"
    ],
    "region": "Europe",
    "subregion": "Western Europe"
  }
}

Response fields

Paths are relative to data. Premium fields are absent rather than zeroed on plans that do not include them, so check for presence instead of comparing to 0.

Field	Type	Example	Description
`country`	string	`France`	Full country name (e.g., France, United States)
`officialName`	string	`French Republic`	Official country name (e.g., French Republic)
`countryCode`	string	`FR`	Two-letter ISO country code (e.g., FR, US)
`callingcodes`	array	`["+33"]`	Array of international calling codes (e.g., +33)
`region`Premium	string	`Europe`	Geographic continent/region (e.g., Europe, Asia, Americas)
`subregion`Premium	string	`Western Europe`	Specific geographic subregion (e.g., Western Europe)

Failure modes

Errors come back as tool errors carrying a sentence the model can act on, not a bare status code. Error handling covers the full list.

Status	What it means
`400` / `422`	The arguments did not validate. The message names the offending one.
`401`	The OAuth session is invalid or expired — reconnect the server.
`403`	Blocked by a key restriction or an IP allow-list. Never a bad identity.
`404`	This skill is not part of VerveKit. Check the catalog.
`429`	Out of credits, or a brief rate limit. The message tells them apart.

A call costs 2 credits each time the tool actually runs; a model that reasons about the tool without calling it costs nothing.

Use cases

Signup Form Prepopulation: When users pick their nationality on signup forms, frontends populate the international phone prefix automatically to avoid input errors.
Contact Record Normalization: Clean customer address books by appending verified country dialing prefixes to local phone numbers stored with ISO country codes.
SMS Gateway Routing: To dispatch two-factor authentication alerts, messaging systems verify recipient phone prefixes against their registered account country.
Logistics Contact Sheets: Shipping platforms convert destination ISO codes into international dialing prefixes so couriers can contact international package recipients.

Other ways to use Calling Code Lookup Skill

Set up Calling Code Lookup Skill on VerveKit, or reach the same source a different way. Your VerveKit account and credits work on all of them — one key, one balance.

Call it as a REST APIOne HTTPS endpoint and an x-api-key header, with SDKs for Node, Python and .NET.APIVerve →Reference →

Google Sheets or ExcelA =VERVE() formula fills a column — no script, no export, recalculates in place.VerveSheets →Reference →

Ground an agent on itA cited, machine-checkable fact your model can't produce on its own.VerveContext →Reference →